Houdini Cow: The Next Great Escape

The cow got out again. How an animal with no opposable thumbs manages to get free from so many different containments is beyond me.  This time he unfastened his halter clip from his lead.  Then he went strolling across the pasture, down the drive way, out the gate, across the street, and up the hill.  He looks like a normal cow but I'm beginning to think there's something extraordinary about him.  I'm wondering if a fence is just another attempt at the impossible.